Malicious PDF — malware analysis report

Static analysis result for SHA-256 8d9fed1bebf6c04f…

MALICIOUS

PDF

62.5 KB Created: 2021-05-11 17:50:16 +03:00 Authoring application: wkhtmltopdf 0.12.5 (via Qt 4.8.7)
MD5: 230926c30ff5a8e9c5a5cc6886420e35 SHA-1: 652c40f653499fd2e5482196c2ca51babcfb248c SHA-256: 8d9fed1bebf6c04feab5ae019c6e527456d1919243d4e26db64a630b178c5857
154 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment T1059.007 JavaScript

This PDF document was detected as malicious by ClamAV and an ML classifier, indicating it is likely a phishing or trojan delivery mechanism. It contains a link farm pointing to compromised WordPress sites, suggesting an attempt to distribute further malicious content. No scripts were extracted, but the presence of multiple external links and the 'link farm' heuristic strongly suggest a phishing or malware distribution vector.

Machine Learning

  • Nyx PDF Classifier malicious score 0.8124

Heuristics 5

  • ClamAV: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Trojan-d2528dad23a95d95-d2528dad23a95d95-10044376-0
  • PDF link farm points to compromised-WordPress upload storage medium PDF_COMPROMISED_CMS_UPLOAD_LINK_FARM
    PDF contains multiple clickable links, across many distinct hosts, whose targets are random-slug files parked in the upload directories of vulnerable WordPress form plugins (FormCraft, Super Forms). This is the hallmark of the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains hosted on compromised sites. The PDF itself carries no exploit — the risk is the linked destinations.
  • Small PDF is a non-clustered link farm on disposable hosting medium PDF_SEO_DISPOSABLE_LINK_FARM
    Small PDF contains many clickable external PDF links spread thin across many distinct hosts (no single dominant host), corroborated by a utm_term SEO-redirector link and/or links parked on free/disposable content hosts. This is the 'free document/template' SEO phishing PDF family, which ranks for search queries and routes users into payload/redirect chains, rather than a normal document citation pattern. The PDF itself carries no exploit — the risk is the linked destinations.
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL https://chamsocmuihong.com/wp-content/plugins/super-forms/uploads/php/files/du7edm8ueft9olao270cqum078/12665365705.pdf
    • http://kfbi.ru/content/file/kimunepu.pdf
    • http://gymostrov.org/gymostrov/userfiles/file/95576172005.pdf
    • http://krindustria.com.br/site/wp-content/plugins/formcraft/file-upload/server/content/files/1606cd811c2697---53265079828.pdf
    • https://www.jemelectric.com/wp-content/plugins/formcraft/file-upload/server/content/files/1607cd61c1f8b4---74644052083.pdf
    • http://reiki-roots.co.uk/wp-content/plugins/formcraft/file-upload/server/content/files/1606d853772d45---mulaxibog.pdf
    • https://www.mozartcantat.nl/wp-content/plugins/formcraft/file-upload/server/content/files/160873481427ad---63034166032.pdf
    • http://getawaynewzealand.co.nz/wp-content/plugins/formcraft/file-upload/server/content/files/16096542c43f42---vafivugopopu.pdf
    • http://chicagohalo.com/wp-content/plugins/formcraft/file-upload/server/content/files/1608752674a3e5---23863952704.pdf
    • http://mirrorgallery.com/wp-content/plugins/formcraft/file-upload/server/content/files/160965a47217c8---sokerubudokurike.pdf
    • https://doitsolutions.co/wp-content/plugins/super-forms/uploads/php/files/18a858ece6f2f862937ea7c5f18b97c7/49138139579.pdf
    • http://halvani.com/wp-content/plugins/formcraft/file-upload/server/content/files/16097c8f2f142b---roren.pdf
    • https://www.femregenx.co.za/wp-content/plugins/super-forms/uploads/php/files/sb49cnlupm9lqvd60lqs4clg25/joxerabolipexowulu.pdf
    • https://jjmassociates.com/wp-content/plugins/super-forms/uploads/php/files/96019fe18949c33e965e42dc6c6335c6/wuponajila.pdf
    • http://www.elitagida.com.tr/wp-content/plugins/super-forms/uploads/php/files/03nm8qmj3mfphpijb1isvs8t84/lituvozufodozexetipum.pdf
    • http://www.ascendercorp.com/
    • http://www.ascendercorp.com/typedesigners.html
    • https://feedproxy.google.com/~r/Uplcv/~3/GLLx1DTH0VQ/uplcv?utm_term=graduated+cylinder+worksheet+printable
    • http://scripts.sil.org/OFL

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
font_00_sfnt_off0000d560.bin
b413f5e5953f35daa3c5af840fb88d8a009db534085dca389b05bb651d3ebb3a		 pdf-font-stream PDF embedded font (sfnt) at offset 0xD560 5592 bytes

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